Looks pretty, kind of a weak story compared to what you'd expect. Definately get Fallout 3...it's like Elder Scrolls with guns, apparently there's about 100 different endings, and total freedom to do what you want, when you want.

Other than that, if you enjoy Gears of War, get Gears of War 2 as well, happily a sequel that improves on the original.

Also, and this is a strange one, get on Xbox Live and download a game called Braid. It's less than a tenner (I can't remember how many points there are to a pound) and it's better than some £30 platformer games.

As for driving games, it depends on whether you prefer them to be realistic (Forza, Gran Turismo etc) or more 'arcadey' (PGR, NFS) but there's plently out there.